Technical data

120
Troubleshooting – Vitocontrol-S, VD2/CT3/CM2
Faults displayed at the programming unit (continued)
Fault
code
System characteristics
Cause Remedy
b
bb
bc
cc
c
Control mode without remote
control
Communication error
Vitotrol remote control,
System circuit A1
Check connections, cable, coding
address “A0” and remote control
DIP switches
b
bb
bd
dd
d
Communication error
Vitotrol remote control,
Mixing valve circuit M2
D
I
P
s
w
i
t
c
h
e
s
b
bb
be
ee
e
Communication error
Vitotrol remote control,
Mixing valve circuit M3
b
bb
bf
ff
f
Control mode Incorrect LON communication
module
Replace communication module
(see page 141)
c
cc
c2
22
2
Open circuit
KM BUS to solar control unit
Check KM BUS cable and solar
control unit
Without solar control unit:
Set coding 54: 0
c
cc
c4
44
4
Faulty communication with Input
Module
0 to 10 V
Check connections and
cables/leads; replace Input Module,
if required
(see page 153)
Without Input Module:
Set coding 9d: 0
c
cc
ce
ee
e
Control mode Communication error
Plug-in adaptor for external safety
equipment
Check plug-in adaptor for external
safety equipment and cables/leads
Without plug-in adaptor:
Set coding 94: 0
c
cc
cf
ff
f
Error
LON communication module
Replace communication module
(see page 141)
d
dd
d5
55
5
Boiler drives up to electronic
maximum limit
Boiler does not log in at cascade Check communication (e.g.
participant check), cables to
Vitotronic 100 and coding
(see from page 92)
d
dd
d6
66
6
Control mode Fault at DE1 in plug-in adaptor for
external safety equipment
To DE1
Check electrical connections on
DE1 to DE3
d
dd
d7
77
7
To DE2
d
dd
d8
88
8
To DE3
5351 340 v1.4